When one fission reaction instigates exactly one more fission reaction it is called?

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Can someone me with 1 to 4 plz. fast

Is a pencil falling to the floor anon contact force, a force, or a contact force